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Battery Guide for Small Stand Alone PV Systems. IEA PVPS Task III 9912231 (33)Lead-Acid Battery Guide forStand-Alone Photovoltaic SystemsIEA Task IIIReport IEA-PVPS 3-06:1999December 1999_______________________________________________________________________________________________________________Battery Guide for Small Stand Alone PV Systems. IEA PVPS Task III 9912232 (33)CONTENTSFOREWORD ..................... 5SUMMARY ................. 61. INTRODUCTION .................. 61.1 Solar energy .......................71.2 Sun power into electricity............